Furnace.



V. MAcKAY.

FURNACE.

APPLICATION min FEB. 18, 914.

Patented Apr. 3, 1917.

4 SHEETS-SHEET 2.

lll

F ii.

wtrwsses:

V". MAC'KA'Y';

FURNACE.

APPLICATION man FEB. 18, I914.

Patented Apr. 3, 1917.

4 SHEETS-SHEET 3- mma V. MAcKAY.

FURNACE. AEPLICATION FILED FEB. 18, 1914.

Patented Apr. 3, 1917.

4 SHEETS-SHEET 4.

imam.

VASIL MAcKAY, or Bos'roN, MASSACHUSETTS.

grates and means for operating said grates to automatically feed fuel and uniformly spread thesame thereover, or to shake the ashes and breakup clinke-rs and fuel.

An object of .this invention is to provide a grate having a plurality of pivoted gratebars which may be manually operated or operated by power driven means to feed fuel thereover from end to end, or be operated to discharge the fuel therefrom.

Another object of the invention is topro- 'vide means adapted to vary the inclination of said grate, whereby the feeding of the fuel thereover may be advanced or retarded. The invention consists in the combination and arrangement of parts whereby the above objects and certain other objects hereinafter appearing may be attained, as set forth in the following specification and particularly pointed out in the claims.

Referring to the drawings:

Figure l is a front elevation of a battery of furnaces, preferably two, embodying my invention.

Fig. 2 is an underneath plan view of the .grate embodying my invention shown in connection with a furnace, portions of said furnace being broken away to save space in the drawing.

Fig. 3 is a sectional elevation taken on line 33 of Fig. 2 illustrating the gratebars in their normal positions in full lines and in their uppermost feeding positions in dotted lines. I

Fig. 1 is a sectional elevation taken on line H of Fig. 2 illustrating the gratebars swung downwardly to their dumping positions.

Fig. 5 is a sectional elevation taken on line 5-5 of Fig. 2.

FURNACE.

PatentedApr. 8, 1917.

' Application filed February 18, 1914.. Serial No. 819,320.

Fig. 8 is a perspective View of the lever by means of which the clinker grate is adapted to be manually operated.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 10 is a furnace of a wellknown type comprising a boiler 11 and a combustion chamber 12 within the side walls 13, front 1-1: and bridge 15, of said furnace. lVithin said combustion chamber is located a grate 16 which embodies my invention and consists of a plurality of series of grate-bars 17 and 18, the grate-bars of each of said series being arranged side by side or in parallelism and each grate-bar 19 being pivotally arranged to swing about a horizontal axis extending transversely of said furnace or combustion chamber adjacent the rear side of said grate-bar.

The grate 16 also includes a frame arranged in said combustion chamber, said frame consisting preferably of a plate 21 located within and against the front wall of said combustion chambenwhile another plate 22 extends across said combustion chamber adjacent the bridge 15. The frame furthermore includes a plurality of longitudinally arranged supports which are supported at opposite ends by the plates 21 and 22 re spectively and preferably in pockets or recesses 21f within which they are held by keys interlocking with lugs 26 which unite to form said recesses, said keys being removably mounted on said plates permitting said longitudinal supports to be quickly detached therefrom.

The, forward plate 21 is preferably rigidly secured in position at the front as stated, while the back plate 22 is mountedupon jacks 27 by means of which said back plate may be raised and lowered, as desired, to vary the inclination of the grate in order that the feeding of fuel along said grate may be advanced or retarded as desired, said jacks being constructed in accordance with any of the well known types.

The longitudinal supports 23 are provided with recesses 28 within which trunnions 29, formed at opposite ends of the grate-bars 19, are adapted to fit and rotate, said trunnions constituting the pivots for said grate bars and as hereinbefore stated are arranged at the rear sides'of said grate-bars.

The upper faces 32 of the grate-bars 19 grate.

are preferably flat and are normally positioned on a level with fhe'up'per faces of the sector in cross section, the forwardside 31 thereof being substantially concentric with the axis of said grate-bar and of sufiicient depth to extend below the upper face of-the ad acent grate-bar, when said grate-bar 1s elevated to its maximum height.

Slots 33 'and 34 are provided in the upper face 32 and the forward side 31 respectively of each. of said grate-bars and constitute draft slots, the number of said slots being varied according to the grade of fuel used and the amount of draft provided; In

the present instance however the slots are far apart and narrow to accommodate soft coal and forced draft. I

The .under sides of the grate-bars 19 are substantially open to permit ashes, which sift through the slots 33 and 34, to. escape. The rear sides 35 of the grate-bars 19 are also curved substantially following an are whose center coincides with the axis of said,

one with the other. Means have been provided to automat cally swing said grate-bars about their re spective axes, said means being preferably connected to said bars insuch a manner that alternate barswill be successively elevated, while the intermediate-bars remain flush with the upper.. surface of the grate, the result of which movement causes fuel resting upon the;g-grate-bar, which is to be elevated, being 4 tlii-bwn upon the intermediate bar, owing to the.- inclination of the upper faces 32,,oflsaid swinging grate-bar and as said grate-bar isdropped-to its horizontal positiont alternate intermediate bars are like wiseel' ed'to advance the fuel another step, and-seen until the fuel has completed its passage from one end to the other of the To accomplish this result, arms 36 are provided for each of said grate-bar, said .arms depending therefrom and connected together in such a manner that alternate grate-bars will be moved simultaneously as oneset and the intermediate or remaining grate-bars asanother set.

To elucidate the arrangement of sald arms and their .connectionsthe first set 'of grate =rods extending in the front wall bars will be} designated a, while the second'or intermediate'set are designated 6. The'arms 36 of the-'grate-bars a areconnected together by a link 37, while the arms depending from the grate-bars b are connected together by a link 38, while to said links, preferably at their inner ends, are secured rods 39 and 40 respectively, said outwardly through slots 41 14 of said furnace and preferabily project a substantial distance therebeyon Teeth 42, preferably four in number are provided upon each of said rods 39 and 40, which teeth are arranged to be successively engaged by teeth 43 formed upon a collar 44, which in turn is mounted upon a shaft 45 journaled to rotate adjacent the front wall of said furnace, said Shaft extending transversely of said furnace and said rods.

There are preferably two series of teeth 43 upon said collar 44, one series of which is adapted to aline with the rod 39, while the other series is arranged to aline withthe rod 40, said series being arranged in such relation relatively to each other that as said collar is rotated, one of said rods will be reciprocatedthrough the slot 42 in said front wall until the forward edges of one of said set'sof grate-bars has been elevated to its maximum height after which the rod for said set will be released permitting said grate-bars to fall to their normal positions and the rod for the other set of said grategrate-bar,thu's permitting said grate-bars'to b be placed substantially near together and swung upontheir pivots without lnterfering 45 by any suitable means, but I have preferably shownin connection withthe furnace 10, an engine'46 which is operatively connected thereto and adapted to continuously rotate said shaft. By extending the shaft 45transversely of the furnace .it will be evident that a large number of sections may be connected therewith and operated by the same engine and in the same manner. When such is the case and more than one boiler is connected thereto, or in a case where two series of grate-bars are employed in one furnace, as illustrated in the drawings, it is often desirable to-operate one series independently of the other and to provide for suchan emergencythe .collar 44 is slidably arranged on .th'eflshaft 45 and prevented from rotating relatively thereto by a key 47 arranged to slide in a slot 48. l

A lever 49 is pivoted in the front wall 14 of said furnace, the'free 'endv of which isadapted to engage an annular groove 50 in said collar. A handle 51 is secured to said 1,221,073 a :11: ll;

scribed for moving said grate-bars are solely,

for the purpose of elevating the same to antomatically feed the fuel along said grate. It often becomes necessary however to operate the device by hand to feed the fuel or break up the clinkers, or furthermore to dump the entire fuel from the grate into the ash pit 53,

To facilitate this operation the arms 36 on the grate-bars are arranged substantially in front of the axis thereof, thus permitting said grate-bars to be rocked about said axes Without said arms striking the forward side 31 of the adjacent bar. The rods 39 and 4:0 as hereinbefore described extend to the front wall ofsaid furnace and project a substantial distance therebeyond and these rods are pi'votally connected to levers 54 and respectively, said levers being pivoted at their lower endsupon brackets 56 preferably secured to the front of said furnace.

In mechanically operating the several grate-bars the positions of the rods 39 and 40 with relation to a horizontal plane are constantly changing, due to the oscillatory movements of the ends of the arms 36, which movement would ordinarily result in throwing the teeth 42 and 43 out of engagement.

To prevent such-an occurrence said rods have been connected to their respective links at points as far from the shaft &5 as possible,

which point is substantially at the rear of the combustion chamber 12, whi. e to still further aid in this particular function the outer ends of said rods have been connected to theirrespectiv'e levers 54 and 55 by studs 57 which are ar anged to slide in slots 58 in said levers. This sliding movement is governed by the slots 11 in the front wall 1% of said furnace through which said rods are adapted to reciprocate, said slots 1 being of,

such a length that as the innerends of said rods 39 and 40 are elevated the rocking of said grate-bars upwardly, as shown in dotted lines Fig. 3, the'studs 57 at the opposite ends of said links will be permitted, to'fall slightly, by their respective levers, until the lower end of said slot 11 is reached, which movement partially compensates, at a point beneath the shaft 15, for said upward movement of the inner end of said links. thereby maintaining the teeth 42 substantially at a uniform distance from the center of theaxis of the shaft 45, while said teeth are in engagement with the teeth 43.

It, is'important that theupper faces 32 of the grate-bars be prevented from dropping below the level of the upper surface ofthe grate during the normal operation thereof,

therefore stops 60 have been-provided, these stops being .pivo tally mounted upon the arranged at suitable Fig; 3, said le\"e1's,'are permitted to move inwardly towardthe frontwall of said furnaceonl'y to the point where said upper faces 32 aline with the upper'surface of the grate. Said stops are adapted to be swung from the positions indicated inFig. 3 in full lines to that shown in dotted lines in said figure, whereupon said levers'54: and 55 maybe moved toward and into contact with said front wall or atleast in contact with stops points on said wall, as indicated in Fig. 4.

In the front wall 14 0f the furnace are provided opemngs 61, one for each series of grate-bars, through whichfuel may be supplied to the fuel chamber 62 at the front end of said grate. Doors 63 are pivotally mount-- ed on said front wall adapted to close said openings, said doors also having openings therethrough which'may be covered by plates 61, as shown in the lefthand furnace in Fig. 1, or hoppers 65 may be attached to said doors to assist in the automatic feeding of the fuel to the fuel chamber 62.

As the fuel is fed into the fuel chamber 62 it is deposited upon a bar 66 similarto the grate-bars19, although somewhat shorter and minus the slots 33 and 34:. This bar coni ing arm 68 which is adapted to be detachablv connected to one of the rods 39 and 40, preferably the latter, by a pivoted arm 69 which is arranged to be swung into and out of a recess ,70 formed at the lower end of said arm 68, thus when the'rod -lO is reciprocated to oscillate the grate-bars connected therewith between the full line positions and the dotted line positions thereof, as shown in Fig. 3, the grate-bar 66 may likewise be oscillated to. feed fuel from the fuel chamber to the grate-bars 19, and furthermore by this connection between said feed bar 66 and said rod, said feed bar will bepositively returned to its normalor full line position in said figure by the combined weights of the several grate-bars connected'cosaid rod. To

operate the grate-bars conne t-ea to the rods '10 to dump the fire the arm 69 isremoved from the recess 70.

r At the rear end" of the-grate 16 and n xt to" the plate; 22' isfarranged a clinkergra'te bar- 1 71, similar in i construct'ion to the gratebars l9,'but reversed to bring the trunnions 72 thereof at the front side of said gratebar instead offlat the rear, said trunnions engaging recesses 7 3 in the longitudinal supports 23 which are covered by the plates 30. The upper face ,74-of this grate-bar is normally arranged to aline with the upper faces nected to an arm '76 depending fromsaid bar, said' rod extending forwardly through the front wall of said furnace to a lever 77 with which said rod is connected in a manner similar to that inwhich the rods 39 and 40 are connected with their respective levers.

The operation of said clinker grate-bar however is independent of the grate-bars 19 and by manual means alone, the proper .'pos1t1on thereof relatively tosaid grate and when in operation, being maintained by a hook 7 8 pivoted on a bracket 79 upon which the lever 7 7 is mounted, said hook being arranged to engage a pin 80 on said lever, as illustrated in Fig. 8, or to be swung rearwardly and disengaged from said pin as in Fig. 4 to permit the rocking of said lever.

The general operation of the device is as follows:

Fuel is introduced to the fuel chamber 62 through the opening 61and deposited upon the feed bar 66, which at this time is in the position illustrated in full lines Fig. 3. The

engine 46 is set into operation-to rotate the shaft 45, whereupon the teeth 43 are moved to engage the teeth l2 and first one and then the other the rods 39 and 40 may be reciprocated to rock its set of grate-bars from the, positions shown in full lines Fig. 3 to the positions shown in dotted lines in said figure to feed the fuel lengthwise of the grate or evenly distribute said fuel throughout said grate.-

In case it is desired to advanceior retard the fire overone or the other series of gratebars, the handle 51 andlever 49 of that series may be rocked, as hereinbefore described, to move the collar engaged thereby and disconnect the teeth 42 on said collar from the teeth on the rods adjacent thereto, thus permitting said rods to be manually operated through the instrumentalities of the levers 54 and 55, or shuold itbe desired to dump the {neon that particular grate, the stop 60 maybe moved from the'full line position, Fig.- 3 to the dotted line position, and said levers 54 and 55 moved from the position in full lines in Fig. 3 to that in full lines Fig. 4.

Each of said series of bars are arranged to operate mechanically or by manual means, thereby permitting the fire in each of said furnaces to be regulated and adjusted at will and a uniform depth of fuel to be maintained throughout the length and breadthof said grate. It will also be obvious-that the alternate pivotal movements of the several sets of grate-bars to feed the fuel from one to the other will. assist in breaking up or loosening up the clinkers which may be formed thereon or to agitate the fuel to such a degree that said clinkers will not have a chance to form. Furthermore the arrangement and construction of the various elements of the device permit the quick displacement of said elements in case of breaka e.

The feeding of fuel from the hoppers at the front to the rear end of the grate will, by the use of the device hereinbefore described, be automatic for as the fuel. or ashes is piled up at the rear end of the grate to a, point abo ve the highest point reached by the last grate bar in said series, the fuel on said last grate-bar, during the upward movement thereof, will be forced therefrom over the front side of said bar to the preceding bar and so on from one to the other toward the front of said furnace, and as no fuel at such a time will be fed forward by the feed bar, owing to the action just described, it will be obvious that no new fuel will be fed from the hopper to the fuel chamber until it is required.

Having thus described my invention what I' claim and desire by Letters Patent to secure is:

1. A furnace having, in combination, a series of grate-bars arranged in parallelism, each of said bars being pivotally supported to swing about an axis disposed adjacent to the rear sides of said grate-bars and extend ing transversely of said furnace, an, arm depending from each of said grate-bars substantially forward of said axis, links connecting the arms of alternate grate-bars together and forming independently operable sets, a rod connected to each of said links, said rods extending forwardly through the front wall of said furnace, and an operating lever pivotally connected with each of said rods, whereby said alternate sets of gratebars may be respectively operated either upwardly to feed fuel longitudinally of said grate Or downwardly to dump said grate.

2. A furnace having, in combination, a series of grate-bars arranged in parallelism, each being pivotally supported to swing about an axis extending transversely of said furnace, an arm on each of said grate-bars, links connecting the arms of alternate gratebars together and forming independently operable sets, a rod pivotally connected to each of said links, said rods extending for wardly to the front wall of said furnace and slidably engaging said wall, a plurality of teeth on said rods, a rotary shaft, means on said shaft adapted to alternately engage teeth on said rods to swing alternate sets of grate-bars successively upwardly step by step, and means to disengage said operating means from said teeth.

3. A furnace having, in combination, a series of grate-bars arranged in parallelism, each being pivotally supported to swing about a longitudinal axis extending transversely of said furnace, an arm on each of said grate-bars, links connecting the arms of alternate bars together and forming independently operable sets, a rod pivotally con-.

nected to the rear portion of each of said links, a plurality of teeth on said rods, a rotary shaft, a pluralityof collars mounted on said shaft adapted to be moved thereon into and out of alinement with the teeth on said rods, said collars each having teeth thereon adapted to engage teeth on said rods and impart an intermittent upward swinging movement to said grate-bars, and meansv to move said collars and their teeth into and out of alinement with the teeth on their respective rods.

4:. A furnace having, in combination, a series of grate-bars arranged in parallelism, each being pivotally supported to swing about a longitudinal axis extending substantially transversely of said furnace adjacent the rear sides of said bars, an arm on each of said grate-bars, links pivotally connecting the arms of alternate grate-bars together to form a plurality of sets of grate-bars, a rod pivotally attached to each of said links, a

series of levers pivotally arranged at the front wall of said furnace, each of said levers being connected to one of said rods and adapted to be manually rocked out wardly to elevate the front. sides of said grate-bars to feed fuel from. the front to ward the rear of said furnace, stops adapted to normally engage said levers to limit the inward movements thereof and aline the up per faces of said grate-bars one with the other, said stops adapted to be moved to permit an additional inward movement of said levers, whereby said grate-bars may be swung downwardly from their normal positions to discharge the fuel therefrom,

5. A furnace grate comprising a series of grate-bars arranged in parallelism, each being pivotally supported to swing about a longitudinalaxis adjacent one side thereof, a plurality of-supports extending longitudinally of said furnace adapted to support said grate-bars, plates extending trans versely of said furnace adjacent to the opposite ends of said longitudinal supports, lugs on said plates forming recesses adapted to receive the ends of said longitudinal supports, and keys placed beneath said supports interlocking with said lugs and removably mounted thereon adapted to support said longitudinal supports within said recesses.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit nesses.

vAsiL MAcKAY,

Witnesses:

SYDNEY E. ,TAr'r', MARGARET E. HORN.

Lift 

